Pachos, J.K., Stone, M. and Temme, K. (2008) Graphene with geometrically induced vorticity. Physical Review Letters, 100 (15). p. 156806. ISSN 1079-7114
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At half filling, the electronic structure of graphene can be modeled by a pair of free two-dimensional Dirac fermions. We explicitly demonstrate that in the presence of a geometrically induced gauge field an everywhere-real Kekulé modulation of the hopping matrix elements can correspond to a nonreal Higgs field with nontrivial vorticity. This provides a natural setting for fractionally charged vortices with localized zero modes. For fullerenelike molecules we employ the index theorem to demonstrate the existence of six low-lying states that do not depend strongly on the Kekulé-induced mass gap.
|Copyright, Publisher and Additional Information:||© 2008 Amer Physical Soc. This is an author produced version of a paper published in Physical Review Letters .Uploaded in accordance with the publisher's self-archiving policy.|
|Institution:||The University of Leeds|
|Academic Units:||The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds)|
|Depositing User:||Sherpa Assistant|
|Date Deposited:||16 May 2008 15:43|
|Last Modified:||14 Jun 2014 18:22|
|Publisher:||American Physical Society|